import 'dart:async';
import 'package:get/get.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
import '../../../data/services/azure_tts_service.dart';
import '../../../core/utils/logger.dart';

// 导入 TtsState 枚举
import '../../../data/services/azure_tts_service.dart' show TtsState;

class AzureTtsTestController extends GetxController {
  final AzureTtsService _ttsService = Get.find<AzureTtsService>();
  
  // 可观察状态
  final isSpeaking = false.obs;
  final errorMessage = ''.obs;
  final isLoading = false.obs;
  final statusMessage = '未连接'.obs;
  
  // 添加实际音频播放状态
  final isAudioPlaying = false.obs;
  
  // 播放状态检查定时器
  Timer? _playbackCheckTimer;
  
  // 当前播放的索引
  final currentPlayingIndex = RxInt(-1);
  
  // 当前使用的语音
  final currentVoice = 'zh-CN-XiaoxiaoNeural'.obs;
  
  // 可用的语音列表
  final List<Map<String, String>> availableVoices = [
    {'id': 'zh-CN-XiaoxiaoNeural', 'name': '晓晓（女声）'},
    {'id': 'zh-CN-YunxiNeural', 'name': '云希（男声）'},
    {'id': 'zh-CN-YunyangNeural', 'name': '云扬（男声）'},
    {'id': 'zh-CN-XiaohanNeural', 'name': '晓涵（女声）'},
    {'id': 'zh-CN-XiaomoNeural', 'name': '晓墨（女声）'},
    {'id': 'zh-CN-XiaoxuanNeural', 'name': '晓萱（女声）'},
    {'id': 'en-US-AriaNeural', 'name': 'Aria（英语女声）'},
  ];
  
  // 固定的播报内容
  final RxList<String> speechTexts = <String>[
    '这是第一条播报测试，请听取Azure合成效果。',
    '这是第二条播报测试，Azure语音合成支持连续多条播报。',
    '这是第三条播报测试，可以测试语音合成的流畅度和连贯性。',
    'This is an English test sentence. Azure Text-to-Speech supports multiple languages.',
  ].obs;
  
  // 事件订阅
  StreamSubscription? _eventSubscription;
  
  @override
  void onInit() {
    super.onInit();
    
    // 初始化UI状态
    isSpeaking.value = false;
    isAudioPlaying.value = false;
    errorMessage.value = '';
    isLoading.value = false;
    
    // 监听TTS服务状态
    _setupEventListener();
    
    // 启动播放状态检查定时器
    _startPlaybackCheckTimer();
  }
  
  // 设置事件监听
  void _setupEventListener() {
    _eventSubscription?.cancel();
    _eventSubscription = _ttsService.synthesisStream?.listen(_handleEvent);
  }
  
  // 处理事件
  void _handleEvent(SynthesisEvent event) {
    switch (event.type) {
      case SynthesisEventType.synthesisStarted:
        statusMessage.value = '合成开始';
        errorMessage.value = '';
        break;
      case SynthesisEventType.synthesisCompleted:
        statusMessage.value = '合成完成';
        errorMessage.value = '';
        break;
      case SynthesisEventType.synthesisCanceled:
        statusMessage.value = '合成取消';
        errorMessage.value = event.reason ?? '未知原因';
        currentPlayingIndex.value = -1;
        break;
      case SynthesisEventType.error:
        statusMessage.value = '错误';
        errorMessage.value = event.error ?? '未知错误';
        currentPlayingIndex.value = -1;
        break;
      default:
        statusMessage.value = '事件: ${event.type}';
        break;
    }
    
    // 强制更新UI
    update();
  }
  
  /// 更新UI状态
  void updateUIState() {
    // 强制更新UI
    update();
  }
  
  // 启动播放状态检查定时器
  void _startPlaybackCheckTimer() {
    _playbackCheckTimer?.cancel();
    _playbackCheckTimer = Timer.periodic(const Duration(milliseconds: 500), (timer) {
      // 更新实际播放状态
      final actuallyPlaying = _ttsService.ttsState == TtsState.playing || _ttsService.ttsState == TtsState.synthesizing;
      
      // 只有状态变化时才更新
      if (isAudioPlaying.value != actuallyPlaying) {
        isAudioPlaying.value = actuallyPlaying;
        // 更新UI
        update();
      }
    });
  }
  
  /// 连续播放所有文本
  Future<void> speakContinuousTexts() async {
    if (isLoading.value) {
      return;
    }
    
    try {
      isLoading.value = true;
      isSpeaking.value = true;
      errorMessage.value = '';
      
      final speaker = currentVoice.value;
      
      // 设置语音参数
      _ttsService.currentVoice = speaker;
      

        // 连续播放所有文本
        for (int i = 0; i < speechTexts.length; i++) {
          // 如果播放被中断，退出循环
          if (!isSpeaking.value) break;
          
          // 在主线程上更新UI
          WidgetsBinding.instance.addPostFrameCallback((_) {
            currentPlayingIndex.value = i;
            statusMessage.value = '正在播放第 ${i + 1}/${speechTexts.length} 条文本';
            update();
          });
          
          // 播放当前文本，不等待完成
          _ttsService.speak(speechTexts[i]);
          
          // 短暂延迟，确保文本被送入队列
          await Future.delayed(const Duration(milliseconds: 300));
        }
        
        // 在主线程上更新UI
        WidgetsBinding.instance.addPostFrameCallback((_) {
          statusMessage.value = '所有文本已送入播放队列';
          update();
        });
    
      
    } catch (e) {
      errorMessage.value = '播放出错';
      if (kDebugMode) {
        print('连续播放出错: $e');
      }
    } finally {
      isLoading.value = false;
      
      // 强制更新UI
      update();
    }
  }
  
  /// 播放单条文本
  Future<void> playSingle(int index) async {
    if (index < 0 || index >= speechTexts.length) {
      return;
    }
    
    try {
      isSpeaking.value = true;
      errorMessage.value = '';
      currentPlayingIndex.value = index;
      statusMessage.value = '准备播放...';
      
      final text = speechTexts[index];
      final speaker = currentVoice.value;
      
      // 设置语音参数
      _ttsService.currentVoice = speaker;
      
      // 使用异步操作，避免阻塞主线程
      Future(() {
        // 播放文本，不等待完成
        _ttsService.speak(text);
        
        // 在主线程上更新UI
        WidgetsBinding.instance.addPostFrameCallback((_) {
          statusMessage.value = '文本已送入播放队列';
          update();
        });
      });
      
    } catch (e) {
      errorMessage.value = '播放出错';
      if (kDebugMode) {
        print('播放出错: $e');
      }
    }
  }
  
  /// 停止播放
  void stopSpeaking() {
    try {
      isSpeaking.value = false;
      statusMessage.value = '正在停止播放...';
      
      // 使用异步操作，避免阻塞主线程
      Future(() async {
        // 停止播放
        await _ttsService.stop();
        
        // 在主线程上更新UI
        WidgetsBinding.instance.addPostFrameCallback((_) {
          // 重置UI状态
          currentPlayingIndex.value = -1;
          statusMessage.value = '已停止播放';
          update();
        });
      });
      
    } catch (e) {
      if (kDebugMode) {
        print('停止播放出错: $e');
      }
      errorMessage.value = '停止播放出错';
    }
  }
  
  // 设置当前语音
  void setVoice(String voiceId) {
    currentVoice.value = voiceId;
  }
  
  // 获取当前语音名称
  String getCurrentVoiceName() {
    final voice = availableVoices.firstWhere(
      (v) => v['id'] == currentVoice.value,
      orElse: () => {'id': currentVoice.value, 'name': '未知语音'},
    );
    return voice['name'] ?? '未知语音';
  }
  
  @override
  void onClose() {
    // 取消事件订阅
    _eventSubscription?.cancel();
    
    // 取消播放状态检查定时器
    _playbackCheckTimer?.cancel();
    
    super.onClose();
  }

  /// 初始化Azure TTS服务
  Future<void> initialize({
    String? subscriptionKey,
    String? region,
  }) async {
    try {
      isLoading.value = true;
      statusMessage.value = '正在初始化Azure TTS...';
      
      if (subscriptionKey == null || region == null) {
        statusMessage.value = '尝试从环境变量读取配置...';
      }
      
      await _ttsService.initialize(
        subscriptionKey: subscriptionKey,
        region: region,
      );
      
      // 检查是否初始化成功
      final isSuccess = _ttsService.isInitialized;
      
      if (isSuccess) {
        isSpeaking.value = false;
        statusMessage.value = 'Azure TTS初始化成功';
      } else {
        statusMessage.value = 'Azure TTS初始化失败';
      }
    } catch (e) {
      statusMessage.value = '初始化异常: $e';
      errorMessage.value = e.toString();
      if (kDebugMode) {
        print('初始化异常: $e');
      }
    } finally {
      isLoading.value = false;
      // 强制更新UI
      update();
    }
  }
}